emb: lines into vectors, against a server that owns the model

This commit is contained in:
funkpower
2026-09-19 12:43:20 -04:00
parent 1071f0bed3
commit c6575b2d42
7 changed files with 1398 additions and 5 deletions
Generated
+744 -3
View File
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"cookie_store",
"flate2",
"log",
"percent-encoding",
"rustls",
"rustls-pki-types",
"serde",
"serde_json",
"ureq-proto",
"utf8-zero",
"webpki-roots",
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"httparse",
"log",
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[[package]]
name = "wasi"
version = "0.11.1+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
[[package]]
name = "webpki-roots"
version = "1.0.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7dcd9d09a39985f5344844e66b0c530a33843579125f23e21e9f0f220850f22a"
dependencies = [
"rustls-pki-types",
]
[[package]]
name = "windows-link"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
[[package]]
name = "windows-sys"
version = "0.52.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
dependencies = [
"windows-targets",
]
[[package]]
name = "windows-sys"
version = "0.61.2"
@@ -596,6 +1178,165 @@ dependencies = [
"windows-link",
]
[[package]]
name = "windows-targets"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
dependencies = [
"windows_aarch64_gnullvm",
"windows_aarch64_msvc",
"windows_i686_gnu",
"windows_i686_gnullvm",
"windows_i686_msvc",
"windows_x86_64_gnu",
"windows_x86_64_gnullvm",
"windows_x86_64_msvc",
]
[[package]]
name = "windows_aarch64_gnullvm"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
[[package]]
name = "windows_aarch64_msvc"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
[[package]]
name = "windows_i686_gnu"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
[[package]]
name = "windows_i686_gnullvm"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
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name = "windows_i686_msvc"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
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"zerofrom",
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"syn",
"synstructure",
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version = "0.6.8"
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+2
View File
@@ -22,6 +22,7 @@ cueseg = { path = "crates/cueseg", version = "0.1.0" }
rrf = { path = "crates/rrf", version = "0.1.0" }
cuepack = { path = "crates/cuepack", version = "0.1.0" }
booksniff = { path = "crates/booksniff", version = "0.1.0" }
emb = { path = "crates/emb", version = "0.1.0" }
clap = { version = "4", features = ["derive"] }
fancy-regex = "0.16"
@@ -34,6 +35,7 @@ serde = { version = "1", features = ["derive"] }
serde_json = { version = "1", features = ["float_roundtrip"] }
thiserror = "2"
unicode-general-category = "1"
ureq = { version = "3", features = ["json"] }
tiktoken-rs = "0.12"
[workspace.lints.rust]
+3 -2
View File
@@ -60,6 +60,7 @@ $ for f in *.pdf; do pdftriage --quiet "$f" && ocrmypdf "$f" "ocr/$f"; done
| `cuenorm` | Any subtitle format in, one normalised cue stream out |
| `cueseg` | A timed transcript into topic chapters |
| `cuepack` | Cues into passages worth embedding, keeping the times they were said at |
| `emb` | Lines into vectors, against an embedding server |
| `rrf` | Several ranked lists into one, without the database |
## The contract
@@ -78,9 +79,9 @@ Every binary in this workspace obeys all of this, or it does not ship.
"broke" are never the same number. A consumer closing the pipe is not a
failure: `… | head -1` exits `0`, like every other filter.
5. **No network, no database, no config file, no state.** Two exceptions, both
declared in `--help`: a tool whose whole job is an HTTP call, and a tool
declared in `--help`: `emb`, whose whole job is an HTTP call, and a tool
that shells out to a named external program and fails clearly when it is
absent.
absent — `pdftriage` needs `pdftotext`.
6. **No ambient knowledge.** No hostnames, no local paths, no private
vocabularies compiled in. General scheme data — Bible book names, ISBN check
digits — may be; anything local is a `--rules file.json`.
+25
View File
@@ -0,0 +1,25 @@
[package]
name = "emb"
description = "Lines in, vectors out, against an HTTP embedding endpoint."
version.workspace = true
edition.workspace = true
rust-version.workspace = true
license.workspace = true
repository.workspace = true
[dependencies]
catena-cli.workspace = true
clap.workspace = true
corpus-core.workspace = true
serde.workspace = true
serde_json.workspace = true
textkit.workspace = true
thiserror.workspace = true
ureq.workspace = true
[dev-dependencies]
serde_json.workspace = true
textkit.workspace = true
[lints]
workspace = true
+275
View File
@@ -0,0 +1,275 @@
//! Lines in, vectors out, against an HTTP embedding endpoint.
//!
//! The one tool here that touches the network, and it does so for a reason:
//! an embedding model is half a gigabyte of weights and a GPU, which belongs
//! behind a server rather than inside a filter. What this owns is everything
//! around the call — batching, the defensive truncation, the retry, and the
//! assertion that the vectors coming back are the width the index expects.
//!
//! The request shape is the one Ollama's `/api/embed` uses, which several
//! other servers also speak.
use std::time::Duration;
use serde::{Deserialize, Serialize};
/// How many texts go in one request.
pub const BATCH: usize = 32;
/// Tokens a single input is cut to before it is sent.
///
/// A defensive cap, not a model limit. A server returns an error for an
/// input past its context length and that error fails the whole batch, so one
/// oversized passage costs thirty-one good ones. Counted with a tokeniser
/// that is not the model's — it is within ten or fifteen per cent, which is
/// all a safety net needs to be.
pub const MAX_INPUT_TOKENS: usize = 1800;
/// How long to wait for a response.
///
/// Generous, because a cold server loading a model onto a GPU can take
/// minutes before it answers at all.
pub const TIMEOUT: Duration = Duration::from_secs(600);
/// How many times a failed batch is tried again.
pub const ATTEMPTS: u32 = 3;
/// What the endpoint is asked.
#[derive(Debug, Serialize)]
struct Request<'a> {
model: &'a str,
input: &'a [String],
}
/// What it answers.
#[derive(Debug, Deserialize)]
struct Response {
embeddings: Vec<Vec<f64>>,
}
/// Why a batch could not be embedded.
#[derive(Debug, thiserror::Error)]
pub enum Error {
/// The server could not be reached, or did not answer well.
#[error("{0}")]
Http(String),
/// The answer was not the shape this expects.
#[error("the server's answer was not an embedding: {0}")]
Shape(String),
/// The vectors are not the width the caller asked for.
#[error("vectors are {found} wide, expected {expected}")]
Width {
/// What came back.
found: usize,
/// What was asked for.
expected: usize,
},
/// The server answered with fewer vectors than it was given texts.
#[error("sent {sent} texts and got {received} vectors back")]
Count {
/// How many texts went out.
sent: usize,
/// How many vectors came back.
received: usize,
},
}
/// Where and how to embed.
#[derive(Debug, Clone)]
pub struct Endpoint {
/// The server's base URL, without a trailing slash.
pub host: String,
/// The model to ask for.
pub model: String,
/// The width the vectors must be, when the caller knows it.
pub dim: Option<usize>,
/// Texts per request.
pub batch: usize,
/// Tokens per text, or `None` to send them whole.
pub max_input_tokens: Option<usize>,
/// How long to wait for one request.
pub timeout: Duration,
/// How many times to try a failing batch.
pub attempts: u32,
}
impl Endpoint {
/// An endpoint with the usual settings.
pub fn new(host: impl Into<String>, model: impl Into<String>) -> Self {
Self {
host: host.into().trim_end_matches('/').to_string(),
model: model.into(),
dim: None,
batch: BATCH,
max_input_tokens: Some(MAX_INPUT_TOKENS),
timeout: TIMEOUT,
attempts: ATTEMPTS,
}
}
/// The URL a request goes to.
pub fn url(&self) -> String {
format!("{}/api/embed", self.host)
}
/// Cut a text to the input cap, if there is one.
pub fn truncate(&self, text: &str) -> String {
match self.max_input_tokens {
None | Some(0) => text.to_string(),
Some(limit) => {
let tokens = textkit::encode(text);
if tokens.len() <= limit {
text.to_string()
} else {
textkit::decode_lossy(&tokens[..limit])
}
}
}
}
}
/// Embed one batch, retrying a failure.
///
/// Waits one second before the second attempt and two before the third, which
/// is long enough for a server that is loading a model and short enough that
/// a server that is simply down does not hold up a pipeline for a minute.
pub fn embed_batch(
agent: &ureq::Agent,
endpoint: &Endpoint,
texts: &[String],
) -> Result<Vec<Vec<f64>>, Error> {
let sent: Vec<String> = texts.iter().map(|text| endpoint.truncate(text)).collect();
let mut last = Error::Http("no attempt was made".into());
for attempt in 0..endpoint.attempts.max(1) {
match post(agent, endpoint, &sent) {
Ok(vectors) => return check(endpoint, &sent, vectors),
Err(e @ Error::Width { .. } | e @ Error::Count { .. }) => return Err(e),
Err(e) => last = e,
}
std::thread::sleep(Duration::from_secs(1 << attempt));
}
Err(last)
}
fn post(
agent: &ureq::Agent,
endpoint: &Endpoint,
texts: &[String],
) -> Result<Vec<Vec<f64>>, Error> {
let request = Request {
model: &endpoint.model,
input: texts,
};
let mut response = agent
.post(endpoint.url())
.send_json(&request)
.map_err(|e| Error::Http(e.to_string()))?;
let body: Response = response
.body_mut()
.read_json()
.map_err(|e| Error::Shape(e.to_string()))?;
Ok(body.embeddings)
}
fn check(
endpoint: &Endpoint,
sent: &[String],
vectors: Vec<Vec<f64>>,
) -> Result<Vec<Vec<f64>>, Error> {
if vectors.len() != sent.len() {
return Err(Error::Count {
sent: sent.len(),
received: vectors.len(),
});
}
if let (Some(expected), Some(first)) = (endpoint.dim, vectors.first())
&& first.len() != expected
{
return Err(Error::Width {
found: first.len(),
expected,
});
}
Ok(vectors)
}
#[cfg(test)]
mod tests {
use super::*;
fn endpoint() -> Endpoint {
Endpoint::new("http://example.invalid/", "a-model")
}
#[test]
fn a_trailing_slash_does_not_double_up() {
assert_eq!(endpoint().url(), "http://example.invalid/api/embed");
assert_eq!(
Endpoint::new("http://example.invalid", "m").url(),
"http://example.invalid/api/embed"
);
}
#[test]
fn a_short_text_is_sent_whole() {
let text = "the mill stood at the northern end";
assert_eq!(endpoint().truncate(text), text);
}
#[test]
fn a_long_text_is_cut_to_the_cap() {
let mut endpoint = endpoint();
endpoint.max_input_tokens = Some(4);
let cut = endpoint.truncate(&"word ".repeat(100));
assert_eq!(textkit::count(&cut), 4);
}
#[test]
fn the_cap_can_be_turned_off() {
let mut endpoint = endpoint();
endpoint.max_input_tokens = None;
let long = "word ".repeat(5000);
assert_eq!(endpoint.truncate(&long), long);
}
#[test]
fn a_width_that_is_not_the_one_asked_for_is_refused() {
let mut endpoint = endpoint();
endpoint.dim = Some(1024);
let sent = vec!["a".to_string()];
let e = check(&endpoint, &sent, vec![vec![0.0; 768]]).expect_err("should refuse");
assert!(matches!(
e,
Error::Width {
found: 768,
expected: 1024
}
));
}
#[test]
fn a_missing_vector_is_refused() {
let sent = vec!["a".to_string(), "b".to_string()];
let e = check(&endpoint(), &sent, vec![vec![0.0; 8]]).expect_err("should refuse");
assert!(matches!(
e,
Error::Count {
sent: 2,
received: 1
}
));
}
#[test]
fn vectors_of_the_right_shape_come_straight_back() {
let mut endpoint = endpoint();
endpoint.dim = Some(3);
let sent = vec!["a".to_string()];
let vectors = vec![vec![1.0, 2.0, 3.0]];
assert_eq!(
check(&endpoint, &sent, vectors.clone()).expect("should pass"),
vectors
);
}
}
+137
View File
@@ -0,0 +1,137 @@
//! Lines in, vectors out, against an HTTP embedding endpoint.
use std::io::Write;
use std::process::ExitCode;
use std::time::Duration;
use clap::Parser;
use corpus_core::exit;
use emb::Endpoint;
/// Embed each line of the input and write its vector.
///
/// One JSON array per line, in the order the lines arrived, so the output
/// lines up with the input line for line. Empty lines are sent as they are:
/// dropping them would make the two disagree.
///
/// The only tool here that uses the network. It never loads a model — the
/// model belongs behind a server, where it can be shared and where its GPU
/// is somebody else's problem.
#[derive(Parser)]
#[command(
version,
about,
after_help = "\
Exit codes: 0 every line was embedded, 65 the server answered something that
was not an embedding, 69 the server could not be reached, 74 the input could
not be read.
Example:
jq -r .text chunks.ndjson | emb --model bge-m3 --dim 1024 > vectors.ndjson"
)]
struct Args {
/// File of texts, one per line. Reads stdin when absent.
path: Option<std::path::PathBuf>,
/// The server to ask.
#[arg(long, default_value = "http://localhost:11434", value_name = "URL")]
host: String,
/// The model to ask for.
#[arg(long, value_name = "NAME")]
model: String,
/// Refuse vectors that are not this wide.
#[arg(long, value_name = "WIDTH")]
dim: Option<usize>,
/// Texts per request.
#[arg(long, default_value_t = emb::BATCH, value_name = "COUNT")]
batch: usize,
/// Cut each text to this many tokens before sending it. Zero sends them
/// whole.
#[arg(long, default_value_t = emb::MAX_INPUT_TOKENS, value_name = "TOKENS")]
max_input_tokens: usize,
/// How long to wait for one request.
#[arg(long, default_value_t = emb::TIMEOUT.as_secs(), value_name = "SECONDS")]
timeout: u64,
/// How many times to try a failing request.
#[arg(long, default_value_t = emb::ATTEMPTS, value_name = "COUNT")]
attempts: u32,
}
fn main() -> ExitCode {
let args: Args = match catena_cli::parse() {
Ok(args) => args,
Err(code) => return code,
};
if args.batch == 0 {
eprintln!("emb: --batch must be above zero");
return ExitCode::from(exit::USAGE);
}
let endpoint = Endpoint {
dim: args.dim,
batch: args.batch,
max_input_tokens: Some(args.max_input_tokens),
timeout: Duration::from_secs(args.timeout),
attempts: args.attempts,
..Endpoint::new(&args.host, &args.model)
};
let text = match catena_cli::read_text(args.path.as_deref()) {
Ok(text) => text,
Err((code, why)) => {
eprintln!("emb: {why}");
return ExitCode::from(code);
}
};
// A trailing newline ends the last line rather than starting an empty one.
let lines: Vec<String> = text
.strip_suffix('\n')
.unwrap_or(&text)
.split('\n')
.map(str::to_string)
.collect();
if text.is_empty() {
return ExitCode::from(exit::OK);
}
let agent: ureq::Agent = ureq::Agent::config_builder()
.timeout_global(Some(endpoint.timeout))
.build()
.into();
let mut out = std::io::BufWriter::new(std::io::stdout().lock());
for batch in lines.chunks(endpoint.batch) {
let vectors = match emb::embed_batch(&agent, &endpoint, batch) {
Ok(vectors) => vectors,
Err(e) => {
eprintln!("emb: {e}");
return ExitCode::from(match e {
emb::Error::Http(_) => exit::UNAVAILABLE,
_ => exit::DATA,
});
}
};
for vector in vectors {
let line = serde_json::to_string(&vector).expect("a vector serialises");
match writeln!(out, "{line}").and_then(|()| out.flush()) {
Ok(()) => {}
// A consumer that stopped reading is not a failure.
Err(e) if e.kind() == std::io::ErrorKind::BrokenPipe => {
return ExitCode::from(exit::OK);
}
Err(e) => {
eprintln!("emb: {e}");
return ExitCode::from(exit::IO);
}
}
}
}
catena_cli::finish("emb", out)
}
+212
View File
@@ -0,0 +1,212 @@
//! The tool against a server, without needing one.
//!
//! The server here is twenty lines of `TcpListener` that answers whatever the
//! test wants it to. That is enough to check the things that actually go
//! wrong: the request shape, the batching, the retry, and what happens when
//! the answer is not what was asked for.
use std::io::{BufRead, BufReader, Read, Write};
use std::net::{TcpListener, TcpStream};
use std::process::{Command, Output};
use std::sync::mpsc;
use std::thread;
/// What a request asked for, as the test wants to see it.
struct Asked {
model: String,
inputs: Vec<String>,
}
/// Answer `replies` in turn, one per request, and report what was asked.
fn server(replies: Vec<(u16, String)>) -> (String, mpsc::Receiver<Asked>) {
let listener = TcpListener::bind("127.0.0.1:0").expect("a free port");
let host = format!("http://{}", listener.local_addr().expect("an address"));
let (sender, receiver) = mpsc::channel();
thread::spawn(move || {
for (at, connection) in listener.incoming().enumerate() {
let Ok(mut connection) = connection else {
break;
};
if let Some(asked) = serve(&mut connection, replies.get(at)) {
let _ = sender.send(asked);
}
if at + 1 >= replies.len() {
break;
}
}
});
(host, receiver)
}
fn serve(connection: &mut TcpStream, reply: Option<&(u16, String)>) -> Option<Asked> {
let mut reader = BufReader::new(connection.try_clone().expect("a clone"));
let mut length = 0usize;
loop {
let mut line = String::new();
if reader.read_line(&mut line).ok()? == 0 {
return None;
}
if let Some(value) = line.to_lowercase().strip_prefix("content-length:") {
length = value.trim().parse().unwrap_or(0);
}
if line == "\r\n" || line == "\n" {
break;
}
}
let mut body = vec![0; length];
reader.read_exact(&mut body).ok()?;
let request: serde_json::Value = serde_json::from_slice(&body).ok()?;
let (status, reply) = reply.cloned().unwrap_or((500, String::new()));
let response = format!(
"HTTP/1.1 {status} X\r\nContent-Type: application/json\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{reply}",
reply.len()
);
let _ = connection.write_all(response.as_bytes());
let _ = connection.flush();
Some(Asked {
model: request["model"].as_str().unwrap_or_default().to_string(),
inputs: request["input"]
.as_array()
.map(|inputs| {
inputs
.iter()
.map(|input| input.as_str().unwrap_or_default().to_string())
.collect()
})
.unwrap_or_default(),
})
}
fn vectors(count: usize, width: usize) -> String {
let one = format!("[{}]", vec!["0.5"; width].join(","));
format!("{{\"embeddings\":[{}]}}", vec![one; count].join(","))
}
fn run(args: &[&str], stdin: &str) -> Output {
use std::process::Stdio;
let mut child = Command::new(env!("CARGO_BIN_EXE_emb"))
.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn()
.expect("the binary should run");
child
.stdin
.take()
.expect("stdin was piped")
.write_all(stdin.as_bytes())
.expect("the input should write");
child.wait_with_output().expect("the binary should finish")
}
#[test]
fn every_line_comes_back_as_a_vector() {
let (host, asked) = server(vec![(200, vectors(2, 4))]);
let out = run(
&["--host", &host, "--model", "a-model"],
"the mill stood\nat the northern end\n",
);
assert_eq!(
out.status.code(),
Some(0),
"{:?}",
String::from_utf8_lossy(&out.stderr)
);
let lines: Vec<&str> = std::str::from_utf8(&out.stdout)
.expect("utf-8")
.lines()
.collect();
assert_eq!(lines.len(), 2);
assert_eq!(lines[0], "[0.5,0.5,0.5,0.5]");
let asked = asked.recv().expect("a request");
assert_eq!(asked.model, "a-model");
assert_eq!(asked.inputs, ["the mill stood", "at the northern end"]);
}
#[test]
fn the_lines_are_sent_in_batches() {
let (host, asked) = server(vec![(200, vectors(2, 2)), (200, vectors(1, 2))]);
let out = run(
&["--host", &host, "--model", "m", "--batch", "2"],
"one\ntwo\nthree\n",
);
assert_eq!(out.status.code(), Some(0));
assert_eq!(out.stdout.lines().count(), 3);
assert_eq!(asked.recv().expect("a request").inputs.len(), 2);
assert_eq!(asked.recv().expect("a request").inputs.len(), 1);
}
#[test]
fn a_vector_of_the_wrong_width_is_refused() {
let (host, _asked) = server(vec![(200, vectors(1, 768))]);
let out = run(&["--host", &host, "--model", "m", "--dim", "1024"], "one\n");
assert_eq!(out.status.code(), Some(65), "bad data must exit 65");
assert!(out.stdout.is_empty(), "a bad answer must write nothing");
let said = String::from_utf8_lossy(&out.stderr);
assert!(said.contains("768"), "{said}");
}
#[test]
fn a_server_that_is_not_there_is_reported_as_unavailable() {
// Port 1 on the loopback: nothing is listening and nothing will be.
let out = run(
&[
"--host",
"http://127.0.0.1:1",
"--model",
"m",
"--attempts",
"1",
],
"one\n",
);
assert_eq!(out.status.code(), Some(69), "unreachable must exit 69");
}
#[test]
fn a_failed_request_is_tried_again() {
let (host, asked) = server(vec![(503, "{}".into()), (200, vectors(1, 2))]);
let out = run(
&["--host", &host, "--model", "m", "--attempts", "2"],
"one\n",
);
assert_eq!(
out.status.code(),
Some(0),
"{:?}",
String::from_utf8_lossy(&out.stderr)
);
assert_eq!(out.stdout.lines().count(), 1);
assert_eq!(asked.recv().expect("a first request").inputs, ["one"]);
assert_eq!(asked.recv().expect("a second request").inputs, ["one"]);
}
#[test]
fn a_long_line_is_cut_before_it_is_sent() {
let (host, asked) = server(vec![(200, vectors(1, 2))]);
let long = "word ".repeat(100);
run(
&["--host", &host, "--model", "m", "--max-input-tokens", "5"],
&format!("{long}\n"),
);
let asked = asked.recv().expect("a request");
assert_eq!(textkit::count(&asked.inputs[0]), 5);
}
#[test]
fn no_input_asks_the_server_nothing() {
let out = run(&["--host", "http://127.0.0.1:1", "--model", "m"], "");
assert_eq!(out.status.code(), Some(0));
assert!(out.stdout.is_empty());
}